61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
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import PySimpleGUI as sg
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import threading
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import time
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"""
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Threaded Demo - Uses Window.write_event_value communications
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Requires PySimpleGUI.py version 4.24.0.17
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Demo of threads using a new way of communicating with threads that is done in a non-polled way.
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No longer do you need to run your event loop with a timeout value in order to multi-thread.
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Now you can pend on your read forever and use a special call that threads can call that will add a new item to the queue
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of items
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"""
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THREAD_EVENT = '-THEAD-'
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def the_thread(window):
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"""
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The thread that communicates with the application through the window's events.
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Once a second wakes and sends a new event and associated value to the window
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"""
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i = 0
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while True:
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time.sleep(1)
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window.write_event_value(THREAD_EVENT, i)
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i += 1
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def main():
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"""
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The demo will display in the multiline info about the event and values dictionary as it is being
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returned from window.read()
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Every time "Start" is clicked a new thread is started
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Try clicking "go" to see that the window is active while the thread stuff is happening in the background
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"""
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layout = [ [sg.Text('My Window')],
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[sg.Multiline(size=(40,20), key='-ML-', autoscroll=True, reroute_stdout=True, write_only=True, reroute_cprint=True)],
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[sg.Input(key='-IN-')],
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[sg.Button('Go'), sg.B('Start'), sg.Button('Exit')] ]
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window = sg.Window('Window Title', layout)
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while True: # Event Loop
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event, values = window.read()
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sg.cprint(event, values)
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if event == sg.WIN_CLOSED or event == 'Exit':
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break
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if event == 'Start':
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thread = threading.Thread(target=the_thread, args=(window,), daemon=True)
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thread.start()
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if event == THREAD_EVENT:
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sg.cprint(f'Data from the thread = {values[THREAD_EVENT]}', colors='white on red')
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window.close()
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if __name__ == '__main__':
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main()
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